back pressure test
41balloon flight — ▪ aviation Introduction passage through the air of a balloon that contains a buoyant gas, such as helium or heated air, for which reason it is also known as lighter than air free flight. Unmanned balloons have been used to carry meteorological… …
42Submarines in the United States Navy — There are two major types of submarines in the United States Navy: ballistic missile submarines and attack submarines. In the U.S. Navy, all combatant submarines are nuclear powered. Ballistic subs have a single, strategic mission: carrying… …
43Water Resistant mark — Water Resistant is a common mark stamped on the back of wrist watches to indicate how well a watch is sealed against ingress of water. It is usually accompanied by an indication of the static test pressure that a sample of newly manufactured… …
44Polygraph — This article is about the forensic instrument. For the automatic signing instrument, see Autopen. For the dual pen device that produces a simultaneous copy of an original while it is written in cursive writing, see Polygraph (duplicating device) …
45Ice core — An ice core is a core sample from the accumulation of snow and ice over many years that have re crystallized and have trapped air bubbles from previous time periods. The composition of these ice cores, especially the presence of hydrogen and… …
46Oil well — The pumpjack, such as this one located south of Midland, Texas, is a common sight in West Texas. An oil well is a general term for any boring through the earth s surface that is designed to find and acquire petroleum oil hydrocarbons. Usually… …
47CF-105 Arrow — Infobox Aircraft name= CF 105 Arrow type= Interceptor manufacturer= Avro Aircraft Limited (Canada) caption= Photo from the Canadian Department of National Defence designer= first flight= 25 March 1958 introduction= retired= status= Cancelled 20… …
48Avro Canada CF-105 Arrow — CF 105 Arrow Photo from the Canadian Department of National Defence Role Interceptor …
49Jet engine — For a general overview of aircraft engines, see Aircraft engine. A Pratt Whitney F100 turbofan engine for the …
50Coandă-1910 — Coandă 1910 …
